Portable electric lamp



oct. 14, 1930. B. ROGGE 1,178,039

PORTABLE ELECTRIG LAMP Filed June 5. 1928 2 SheQtS-Shet l llllllllllllmlm y .77212922 for:

Oct. 14, 1930. Y B. ROGGE 1,778,039

PORTABLE ELECTRIC LAMP Filed June 5, 1928 2 Sheets-Sheet 2 Patented Get. 14, 1930 PATENT OFFICE BERNHARD ROGGE, OF BERLIN, GERMANY PORTABLE ELECTRIC LAMP Application filed June', 1928, Serial. No. 253,040, and in Germany August 2, 1927.

This invention relates to the casings of portable electric lamps with adjustable focus and has for its object to simplify both the manipulation and the internal construction of such lamps. For simplifying the manipulation,- means are provided whereby the adjustmentof the focussing effect, i. e., the alteration of the beam of rays, can be effected p by means of the contact making switch meinle ber, so that the lamp need no longer be operated with both hands, but isv capable of being focussed and switched off ,with one hand only. For simplifying trie construction of the lamp, such a part of the casing yis 1.5 used as the slidable part for focussing the beam of rays as will not entail any complication in the internal arrangement of the lamp for maintainingthe Contact during the vadjusting operation; 2ov` TheV invention consists more particularly .in this, that the reflector or the top cap. or both are connected to theswitch member and are capable of being slid togetherwiththe same. This provides the two advantages referred to above vover portable lamps Y of the known kind, in which the incandescent lamp is rslidable together ywith the tion and simplified manipulation notV found in the known lamps. n

In the accompanying drawing'several constructionalexamples of the lamp according to the present invention are illustrated. Fig. l is a side elevation of one constructional form of lamp, Fig. 2 a side elevation partly 'in section at y90 to Fig.` l'. Figs.. 3 and l i and Figs. `5 and 6 show corresponding Views Vof, two other, constructional forms. Fig. l" is a section to an enlarged scale on line A B fourth constructional form, Fig. 9 a partial section .to an enlarged scale online C lD of Fig8 andfFig. l0 a plan view Vof Fig. 8. Fig. l1 shows a view, partly in section of lifthconstructional form and Fig. 1Q is detail of Fig. l1 to an enlarged scale.

A In the constructional form shown in l ,to 7, on the main part lof thev casing', which contains the-incandescent laInpQ and the battery 3, the top cap 4 with the coverswitch member, namely the simple construc-r ofFig. 5. Fig. 8 is a side elevation of la f ing disc 5 is longitudinally slidable. This covering disc 5 may be either a lensor in many of the constructional forms a simple disc of glass or the like, which has no effect on the direction of the rays of light. In all these constructional forms the switching member has the form of a knob 6 located at the side ofthe part l of the casing and capable of being slid longitudinally of the casing.

In the lamp shown in Figs. 1 and 2 the connection between the top cap 4; and the knob 6 is established in accordance with the invention in a simple manner by a strip 7 which can be slipped resiliently over knob 6. On the knob 6 beng pushed upward, the contact'spring 8 which is connected to it will make'contact, shortly after the commencement of the motion of thefknob, with the second.l contact spring 9 and will close the circuit. During the further displacenient of the knob 6 the contact will remain closed, as the springs 8, 9 remain in contact withone another (Fig. 2). As long as the sliding motion of the knob 6 continues, the cap 1l with the covering.v disc 5, which in the present instance influences thebeam of rays and must therefore be a lens, will takek part in the sliding motion, thereby causing the shape of the beam to change. The reflector l() is fixed to the part lA of the casing and does not take partin the displacement of the cap 4l. f

' ln the constructional form shown in Figs. 3 and l the reflector l0 is slidable (see Fig. 3). For this purpose the reflector is fixed to the contact spring `8 which is attachedV to the knob 6f The manner in which this lamp operates will be readily understood from the drawing. The cap 4 with the covering disc 5 which in thiscase need not be a lens is simply slipped on to the part of the casing and kdoes not take part in the displacement. ln the lamp shown in Figs'. 5 to 7 the reflector 10 is fixed to the top cap Ll. The cap is connected rtothe part 1 of the casingby means of a bayonet catch device l1. On sliding the knob 6 with the contact spring 8 which coacts with the second contact spring 9 and during the whole duration of witha spindle 1Zl. -.`l'l"olthe spindleY 14 kthe" reflector 10 with the` covering' disc 5V Yis 'fixed by means of an angle piece 15. At the rear the sliding motion of the knob 6 remains in cont-act with the said spring 9, the cap e with the covering disc 5, which need not be a lens, and with the reflector l0 is displaced relatively to the incandescent lamp 2.

A particular' advantage of thisconstructional form is that when the incandescentv lamp .2'is` switched on, :the top cap el is locked tothe part 1 of the casing, so that it cannot slip down inadvertently. rlhis locking of the parts is eifeoted by the shank 12 of the knob 6 being provided -with a collar. 12. which is capable of engaging in a recess '14 at the end of a transverse arm of theslot 11; TWhen the lamp is switched oil, the collar 12 can be pushed into afrecess 14 in the casing 1, whereupon, by turning the cap l and then vwithdrawing it, the capcan be removed from the casing 1. l'vlhen'the knob 6 withthe-cap is `slid longitudinally of the casing lor switching on' the lamp, the collar 12 can no `longer be pressed into the recess lll, so that the cap is locked. For the rest through the use of the bayonet catch arrangementll' they cap Ll is secured Afrom being inadvertently turned oil", even in theposition shown. in Figs. 5 and 6 in ieullrlines, through those parts of the cap'l vwhich kare near the knob 6, 12 being under a certainv tension, as long as the cap isfbeing slidoverthe knob and has not as yet reachedits end position, which tensionv is released in the said position by the provision of the small recesslfl (Fig. 7).v y

In the constructional forni shown in Figs.

8 and 9 anaproii 18 is provided on the lens cap 4, a crank'slot l1 in which engages over the Contact knob 6 ofthe torch. The apron ,Y 18 contains a second yslot 19,"in which a Alocking pin QOengages. `This locking pin is supported by a vspringl within the casing therefore vbe'oi-ced out of the slot 19 for the purpose of taking-lofi' the cap l. Foretaking oil the lens cap, it is grasped withVY oneghand, the locking pin 20 beingV pressed intothe, casingby'on'e ingerof the same hand. As' the Vouter end of the pin is rounded, the cap can first-'be turned about the axis of the casing, whereupon, after the knob 6- has entered the axially directed part of the -slot'-11,- the cap lwith the lens caribe,withdrawn.v y' 'I l- To preveiitfthelens turning in the cap,V

when the latter 'is'fbeiiig removed which would tend to loosen it, the otherwise round lens `has an octagona-l flange 22,-which lits kcombination a casing,

engaging in the saidv slot for loc 0 -len's cap in end of the Vreflector l0 is a cylinder 16 on which is acontact SYin the torni of a rail,

the second contact 9 which is in the form of a spring being xed to a partition 1.7 in the casing 1, Un the nut 6 being turned, the

spindle 14 with the reflector 10 and the parts fixed to the same is displaced. This movement of the parts first establishes contact between the contact members 8"and 9 vand then influences the beain'of rays'emanating fori concentrating the liO'lit emitted by trie vfrom the incandescent lamp 2 in the manner` said incandescent lampr along a beam and contact-making switch member capable ol shifting the said cap relatively to the incandescent lamp, as and tor. the purpose set forth. Y

Y 2. 'A portable electric'lanip comprising in y an incandescent lamp liXed lwith respect to the casing, covering cap on the casing, means for' concentrating the light emitted bythe said vincandescent lamp along a beam, a Vcontact-inak *twitch member capable of shifting the said'V means relatively-to the incandescent lamp, Aanr extension on the said lens cap ertc'idingfover the saidswitoh member, a. slot thesaid extension and a pin'on thecasr` q capable of y e said purpose position, as and 1for setforthi v' Y AIn testimony whereof, l1 have signed my name to this speciiifcationfthis ht March, 1928.V

Y y Beantragen Rosen) exactly into the octagonal flange' 23 of theA i In v'the lamp member 61 is in the formV of a screwk nut shown in v lligsQll and l2 Y which is intended tobe used more particii 1 larlyfor a.. stand-lamp 'but can also besus. Vpendedto a 'bicycle or the like, the switchl Liday of ile. j, 

